gulp-clean-css 合并css

https://www.npmjs.com/package/gulp-clean-css

npm i gulp-clean-css

let gulp = require('gulp');
let cleanCSS = require('gulp-clean-css');

gulp.task('minify-css', () => {
return gulp.src('styles/*.css')
.pipe(cleanCSS({compatibility: 'ie8'}))
.pipe(gulp.dest('dist'));
});